Malicious PDF — malware analysis report

Static analysis result for SHA-256 471b46efea552230…

MALICIOUS

PDF

78.3 KB Created: 2021-06-30 18:11:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 48f2cdf576c94496c0deba2ccbd46e4a SHA-1: 07ca6794e3f784ff74face15719995512d7cb49b SHA-256: 471b46efea5522302b74f4c307f959a4faa87253226674b6f016e2f702345ff0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm used for phishing or distributing further malware. The presence of embedded URLs and the overall structure point towards a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://laborke.ru/uplcv?utm_term=buckling+strength+of+metal+structures+bleich+pdf PDF link annotation
    • https://alshamiltrading.com/alshamilfiles/file/jilosiwejozugaxeko.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/49iu93du975qu60ffiqlgmo97t/18882311562.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/netavinivefikesevuw.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096a16269cb5---94241708716.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/62aec0b83a377a0cdc89606c13710b80/404568038.pdfIn PDF document text
    • https://mangmalungtea.com/userfiles/file/wedap.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/145ce02ee7c2a419b28eaf53771c751f/70236121606.pdfIn PDF document text
    • https://advik.net/userfiles/file/zonuwulewonidewuremom.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16070d86c97964---nijogogudujapopuketim.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/ligutewer.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/suvonobasu.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/aeak82svft3uarf3lau0klvbs6/wolobaruwexajekogepefuse.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/e7g8dev8p755jgd5hhourfpbn1/gufefuravol.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/f8afef8f3fd7b61ae14200a9b4573990/41743573758.pdfIn PDF document text
    • https://landbar.com/upload/files/rebuve.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160715e00251c5---nefetu.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c9527a08219---valoxofu.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0b02a2c8b---bebifuledolotalotil.pdfIn PDF document text
    • http://hibertek.com/image/files/20210619_060852.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/tafimaguwogatijefe.pdfIn PDF document text
    • http://sanders-scottfamily.com/clients/26926/File/52576487941.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/xibopivefubujidixetadexo.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/garolewenavitinep.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/4a9mpjv5ucibqfg8bbfi02i0rj/73440659243.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E1 11452 bytes
SHA-256: 5575a2d4a0367af0229a29ea9a208ab3841a2e0e0621259be85948feb801bd8b
font_02_sfnt_off0000fe5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5C 17384 bytes
SHA-256: 26c91c99256d1e9fd8272f658385429154a17b3b10543ea9b7cd6a4be0f66b6e

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